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<p>Lathe chucks are commonly used in engineering industries to hold both regularly and irregularly shaped work pieces during machining operations. There are two main types of chucks currently available: three-jaw chucks (capable of self-centering) and four-jaw chucks (capable of manual individual adjustment). This study seeks to integrate self-centering and individual adjustment capabilities into a single chuck assembly, thereby contributing to cost-effectiveness as well as improved time management in day-to-day industrial operations. The study highlights a novel internal gear train mechanism that can be incorporated into any chuck to facilitate both self-centering and individual adjustment. The mechanism involves four bevel pinions, each controlling one of the four jaws on the chuck, and a central bevel gear which, when engaged, allows all four jaws to move linearly by the same distance when any one of the bevel pinions is rotated. Manual calculations were carried out to determine the torque required for clamping, the stresses acting on the spindle screw threads, and the contact stresses between gear teeth. The torque required per jaw was found to be 88.73 Nm (µ = 0.08) and 146.64 Nm (µ = 0.16) to achieve a maximum clamping force of 65 kN, with AGMA contact stresses between 657 and 845&#xa0;MPa at the gear interface. Finite element simulation corroborated these results by showing maximum Von Mises stresses between ~ 315–430&#xa0;MPa near the contact surfaces and roots for µ = 0.08 and ~ 560–705&#xa0;MPa for µ = 0.16. These findings provide evidence to support the mechanical robustness of the mechanism under realistic loading conditions while ensuring that stress levels remain within safe operating limits.</p>

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Design and evaluation of a novel dual-mode four-jaw lathe chuck using analytical methods and fea-based simulations

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • Srihari Srikanth,
  • Aman Shameer KM,
  • Bhairavi Mahadev,
  • Rahul Manoj Nellanickal,
  • Abishek SA

摘要

Lathe chucks are commonly used in engineering industries to hold both regularly and irregularly shaped work pieces during machining operations. There are two main types of chucks currently available: three-jaw chucks (capable of self-centering) and four-jaw chucks (capable of manual individual adjustment). This study seeks to integrate self-centering and individual adjustment capabilities into a single chuck assembly, thereby contributing to cost-effectiveness as well as improved time management in day-to-day industrial operations. The study highlights a novel internal gear train mechanism that can be incorporated into any chuck to facilitate both self-centering and individual adjustment. The mechanism involves four bevel pinions, each controlling one of the four jaws on the chuck, and a central bevel gear which, when engaged, allows all four jaws to move linearly by the same distance when any one of the bevel pinions is rotated. Manual calculations were carried out to determine the torque required for clamping, the stresses acting on the spindle screw threads, and the contact stresses between gear teeth. The torque required per jaw was found to be 88.73 Nm (µ = 0.08) and 146.64 Nm (µ = 0.16) to achieve a maximum clamping force of 65 kN, with AGMA contact stresses between 657 and 845 MPa at the gear interface. Finite element simulation corroborated these results by showing maximum Von Mises stresses between ~ 315–430 MPa near the contact surfaces and roots for µ = 0.08 and ~ 560–705 MPa for µ = 0.16. These findings provide evidence to support the mechanical robustness of the mechanism under realistic loading conditions while ensuring that stress levels remain within safe operating limits.